boyden



2 Sheets-Sheet 1.

(No Model.)

G. A. BOYDEN.

FLUID PRESSURE GAR BRAKE.

Patented Jan. 11, 1887.

ITWETHUE:

(No Model.)

2 Sheets-Sheet 2.

G. A.'BOYDEN.

FLUID PRESSURE GAR BRAKE.

N0. 356,057. Patented Jan. 11, 1887.

InvETdfir:

V \FHHEEEE tl iTE STATES 'ATENT Fries.

GEORGE A. BOYDEN, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF TO CHARLES B. MANN, OF SAME PLACE.

FLUID-PRESSURE CAR-*BRAKE.

SPECIFICATION forming part of Letters Patent No. 356,057, dated January 11, I887.

Application filed June 22, 1886.

T aJZZ whom it may concern:

Be it known that I, GEORGE A. BOYDEN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Fluid-Pressure Oar-Brakes, of which the following is a specification.

This invention relates to special mechanism for car-brakes of that class in which the agent 1 for communicating the power is fluid under pressure.

The object ofthe inyentioiris to provide special mechanism for connection with the ordinary brake mechanism 011 the truck,where- I 1 by the action of a collapsible and expansible train-pipe may be availed of to operate the said ordinary brake mechanism, which term includes brakeshoes, beams, and levers.

The collapsible and expansible train-pipe 2 herein shown is also shown, described, and

claimed in my application for patent filed April 12, 1886, Serial No. 198,545.

The present invention is illustrated in the accompanying drawings, in which- Figure 1 is a side view of a car equipped with myimprovements. Fig. 2 is a vertical longitudinalsection of the equipped car. Fig. 3 is a top view of the trucks and brake mechanism of a car without the car-body, and show- 0 ing the collapsible and expansible train-pipe. Fig. 4 is a view, larger scale, of the train-pipe gripper and rod. Figs. 5 and 6 are perspective views of parts of the gripper. Fig. 7 is a view showing two grippers and the train- 5 pipe. In one gripper the train-pipe is collapsed, and in the other it is expanded; and also shows a source of supply of fluid-pressure.

Referring to the drawings, the letter A designates a car; 13, the trucks of the car equipped with ordinary brake mechanismto wit, brake-shoes n, beams, and brake-lever k-and also the hand-wheel O on the upright shaft.

The action of a collapsible and expansible train-pipe or hose, L, is to be utilized in oper- 5 ating the above-named ordinary brake mechanism. The collapsed condition of the trainpipe is shown in the gripper d d at the left of Fig. 7. This condition is produced by a withdrawal or exhaustion of fluid-pressure from the train-pipe. The expanded condition of the train-pipe is shown in the right-hand Serial No. 105,865. (No model.)

gripper d dof Fig. 7. This condition is produced by the fluid-pressu re, the fluidsuch as water, oil, steam, or ai rbeing.in and throughout the pipe.

The invention which forms the subject of thispatent is the herei n-described mechanism, which enables the collapsible and expansible action, as aforesaid, of the train-pipe to be availed of.

,A gripper for the train-pipe or hose L consists of two jaws, d (1, one of which, d, is stationaty and the other, d, movable. Onejaw, d, has a flange, (1 by which it is rigidly fixed to the car by bolts d passing through the said flange into the car-frame. The movable jaw 01 is attached to a rod, e, which is supported below the car-body in bearings f, and said'rod extends in a direction crosswise of the car-body. This rod carrying the jaw d 7 has movement in its bearings. A pulley, g, is mounted on the said rod. This pulley, as here shown, turns on a pivot fixed to a collar, g, which is adjustable on the rod. A spring,

6, surrounds the rod and is compressed between one of the fixedjaws d and a collar, e, on the rod. This spring moves the rod eendwise, and thereby brings the movable jaw (1 toward the stationary jaw, at which time the train-pipe is collapsed. The construction here is such that in this (closed) position of the jaws the brake-shoes a are held off. Two other pulleys, h, each turn on a pivot which is fixed to and below the car-body, and each is at an opposite side of the rod 6. A chainJ, 8 passes on one side of the rod-pulleygand on the opposite side of the two fixed pulleys h and connects with the brakelever k on the car-trucks B. In the present instance both trucks are equipped with brakes, but the mechanism operates equally well if only one truclr is equipped.

The hand-wheel O operates the ordinary brake mechanism on the trucks by means of a chain, 0, which has one end attached to the 9 5 rod e.

It will be seen that when the train-pipe expands the gripper-jaws will be forced apart, all of the expansion of the train-pipe taking effect on the movable jaw, and thereby the the brake-shoes a will be applied to the wheels. This mechanism and the collapsible and expansible train-pipe may be used, as above described, to apply the brakes by the expansion of the train-pipe, which is direct action, or, reversely, the expansion may serve to hold the brakes off, while the spring 6 applies the brakes. This latter may be termed ,automatic action.

Referring again to the rod and gripper, it will be seen by reference to Figs. 3 and 4 that the rod 6 carries two gripper-jaws, d, one at each end. The car-bod y also has at each side a stationary gripper-jaw, d. The stationary jaw 62 on one side of the car-body-isthe-outermostjaw of the gripper, and on the other side it is the innermost jaw of the gripper. By this arrangement the stationary jaw on one side co-operates with a movable jaw in areverse or opposite manner from the stationary jaw on the other side of the car-body,whereby a movement of the rod ewill have the same effect on the gripper at each and bothsides of the car-body.

The train pipe hose L extends along the train of cars at one side only, and the abovedescribed arrangement and combination of two grippers, one at each side of the car;body, provides for a proper connection with the train-pipe,whichever side of the car happens to be next thereto.

Each stationary jaw has two holes, Z, and each movable jaw has two pins, Z, which occupy the said holes. In practice the length of the gripper-jaws d (1 determines the pressure that will be exerted by the expansion of the train-pipe L. Whatever fluid-pressure there may be in the train-pipe, that which will be exerted on the rod 6 will be more or less, according as the gripper-jaws are longer or shorter. As will be readily perceived, the shape and construction of these jaws may be varied or changed from that here shown without departing from the essence of my invention.

Fig. 7 illustrates a source of supply of fluidpressure. A tank, 0, is for compressed air which is to enter the train-pipe L. A pipe, q, connects the tank with the train-pipe, and a three-way-cock, 8, controls the passage of the air-under pressure to the train-pipe. An exhaust-pipe, t, connected with the three-way cock, provides for the release of the pressure from the train-pipe. A steam-cylinder, U, and a condensingpump, V, of usual construction, are employed to compress the air.

' Having described myinvention, Iclaim and desire to secure by Letters Patent of the United States- 1. The combination, with a collapsible and expansible train-pipe, L, through which fluidunder pressure passes, of ordinary brake mechanism on the car, and a gripper having a sta tionary jaw, d, and a movable jaw, d, which latter is connected with said brake mechanism, for the purpose specified.

2. The combination of ordinary brake mechanism, a gripper having a stationary jaw and a movable jaw, a rod, e, 'attached to the said movable ,jaw and carrying a pulley, g, a pulley, 71., turning on a fixed pivot at one side of the said rod, and a chain passed on one side of the rod-pulley and on the opposite side of the fixed pulley,and connected with the brake mechanism, as set forth.

3. The combination of ordinary brake mechanism, a gripper having a stationary jaw and a movable jaw, a rod, 0, attached to the said movable jaw and connected with the brake mechanism, a hand-wheel, O, on a shaft, and a chain, 0, connecting the said shaft with the jaw rod e, for the purpose specified.

4. The combination, with a collapsible and expansible train-pipe, L, through which fluid under pressure passes, of ordinary brake mechanism on the car, and two grippers, one at each side of the car-body,conneeted together, and also connected with said brake mechanism, substantially as described, whereby a proper connection may be made withthe said train-pipe, whichever side of the car happens to be next thereto.

In testimony whereofI affix my signature in the presence of two witnesses.

GEORGE A. BOYDEN.

Witnesses:

J OHN E. Monnrs, J NO. T.,1\IADDOX. 

